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As stated before, Constable Lam FAILED to do his job. He never received any commendations from Toronto Police or any awards from any level of government for his actions. Lam was not prepared. He was more than justified to shoot and kill a person who just committed mass murder and was posturing to shoot him and was lucky Minassian didn't have a firearm or he would be a dead man. Lam did not shoot because he was incompetent and did not have a round in the chamber like he was supposed to. You talk about a person not being able to handle stress, and the associated adrenaline and cortisol effects? That was Constable Lam that day. It's clearly captured on video. Go find a Toronto Police officer, any Toronto Police officer and ask about Lam. Not a single one will say he performed properly.
You're warping the narrative.